If you need help connecting the SIM900 to the arduino you can check out this tutorial: Guide to SIM900 GSM GPRS Shield with Arduino Here's the connection diagram anyway. From my experience, the second ...

Note that an active-low (L) at pin 1 of connector J2 triggers the security system. Further, an optional “call – alert” facility is added to the security system, which will initiate a telephone call ...

GSM modules are interesting to use especially when our project requires remote access. These modules could make all actions that our normal mobile phone could do, like making/receiving a call, sending ...

Hence we have connected all the pins accordingly. For a better understanding, I am attaching a connection diagram below. So, you can see that the connections are not complex. You have to keep the ...

A new switch design method by applying depletion-mode field effect transistor for dual-band GSM switch diplexer module is presented here. If compared with switch module implemented by using PIN diode, ...